wear smooth 磨平
He made every effort to smooth out his habitual worried look and wear a sunny smile, since a happy expression can lead to genuinely happy feelings.
他努力消除他惯常的忧虑神情，脸上挂着灿烂的笑容，因为快乐的表情会带来真正快乐的感觉。
If you want to wear every day, the best maintenance method is to tighten the spring every two weeks, to ensure that the normal smooth running gear.
如果每天都要佩戴，最好的保养方法是每两个星期紧一下发条，保证它的齿轮正常顺滑运转。
Due to the amount of extreme pressure additives on high speed, into the cutter, cutter still wear, smooth surface products.
由于加进适量极压添加剂对高转速，大进刀具时，刀具仍然耐磨，制品表面光滑。
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